Is it really 10-bit? Question for Gary Adcock

... or anyone who knows. Does using Apple Compressor to convert QT Proxies (from Red Alert) into ProRes HQ create a true 10-bit video? Or does it fake it like Quicktime does in other types of conversions?

The Quicktime reference movies point directly to the original 12bit R3D data. If the host app asks for an 8bit decode, it will give it to them. If it asks for the r4fl pixel type (32 float YCbCr) it will give it to it in that format. r4fl is what FCP uses for 10bit codecs.